actives
The Science vs. The Hype: Why Dermatologists Trust GHK-Cu
Why Dermatologists Are Taking GHK-Cu Seriously: The Science Behind Copper Peptides
Copper peptides are having a moment in skincare. But unlike many ingredients that become popular almost overnight, GHK-Cu has more than five decades of scientific history behind it.
First identified in 1973, this naturally occurring copper-binding peptide has been studied for its role in collagen production, skin remodelling, tissue repair and cellular processes involved in maintaining healthy skin.
And now, dermatologists are taking a renewed interest.
In a September 2026 interview with Allure, board-certified dermatologist Dr. Nancy Samolitis discussed reviewing the published GHK-Cu research. A small human study measuring collagen production particularly caught her attention. She found the results encouraging enough to purchase two over-the-counter copper peptide serums herself. [1]
Her interest reflects something important: GHK-Cu isn't simply another fashionable skincare ingredient. It has an established body of biological research and human cosmetic studies reporting improvements in skin firmness, density, fine lines and overall appearance.
Here's what the science actually shows.
Why GHK-Cu interests dermatologists
GHK-Cu stands for glycyl-L-histidyl-L-lysine copper, a naturally occurring tripeptide that binds copper ions.
Copper is essential to several biological processes, including those involved in connective tissue formation and antioxidant defence. GHK acts as a copper-binding peptide and has been investigated for its involvement in skin repair and remodelling.
Research has identified several particularly interesting activities:
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Collagen support: Laboratory studies have shown that GHK-Cu can influence collagen synthesis and remodelling.
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Skin firmness and elasticity: Human cosmetic studies have reported improvements in skin density, firmness and laxity.
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Skin renewal: Research has explored its effects on fibroblasts, keratinocytes and processes associated with tissue regeneration.
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Antioxidant activity: Experimental findings suggest a role in cellular defence against oxidative stress.
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Visible signs of ageing: Topical studies have reported improvements in the appearance of fine lines, wrinkles and skin texture.
These findings help explain why GHK-Cu continues to attract attention in research related to skin health and longevity. [2, 3]
What the human studies found
Perhaps the most compelling part of the GHK-Cu story is that researchers haven't limited their investigations to laboratory models. Several small studies have examined how topical copper peptide formulations perform on human skin.
Collagen production: A comparative investigation
In a study involving 20 women, researchers examined collagen-related changes after applying creams containing GHK-Cu, vitamin C or retinoic acid to the thighs.
After one month, an increase in measured collagen production was reported in:
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70% of participants treated with GHK-Cu
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50% of participants treated with vitamin C
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40% of participants treated with retinoic acid
The findings were assessed using skin biopsies rather than appearance alone. [2, 4]
These results attracted the attention of Dr. Nancy Samolitis when she reviewed the research for Allure in 2026.
The study was small, and its percentages represent the proportion of participants showing increased collagen production, not the percentage increase in collagen itself. Nevertheless, it remains an interesting early human investigation into GHK-Cu's biological activity.
Improvements in facial skin after 12 weeks
A study involving 71 women with signs of photoageing examined a GHK-Cu facial cream over 12 weeks.
According to the published research review, investigators reported improvements in skin laxity, clarity and overall appearance, alongside reductions in fine lines and wrinkle depth. Measures of skin density and thickness also improved. [2]
Eye-area improvements
Another 12-week study evaluated a GHK-Cu eye cream in 41 women with mild to advanced photodamage.
Compared with its control formulations, the copper peptide cream was reported to improve the appearance of lines and wrinkles, overall skin appearance, and measures of skin density and thickness. [2]
Another facial study involving women aged 50–59
In a further investigation involving 67 women aged 50 to 59, twice-daily use of a GHK-Cu facial cream over 12 weeks was associated with improvements in firmness, skin clarity, laxity and visible wrinkles.
Researchers also reported changes in skin density and thickness. [2]
Taken together, these studies provide an encouraging basis for continued clinical interest. They are relatively small historical investigations, with several results reported through later reviews, but they give GHK-Cu a meaningful scientific foundation in topical skincare.
What dermatologists are saying today
GHK-Cu has gained fresh attention from medical professionals reviewing both the historical research and its potential role in modern skincare routines.
Dr. Nancy Samolitis, board-certified dermatologist
Speaking to Allure in September 2026, Dr. Samolitis discussed the small comparative collagen study and described its findings as encouraging.
She also said:
"I think it's a good retinol alternative."
Her comments were made in the context of its potential role for people who find traditional retinoids difficult to tolerate. She emphasized that more high-quality human research is needed, but found enough promise in the evidence to personally try over-the-counter copper peptide products. [1]
Dr. Marisa Garshick, board-certified dermatologist
In British Vogue, Dr. Garshick explained how copper peptides can support collagen- and elastin-related processes, with potential benefits for skin firmness, texture and fine lines.
She also highlighted their antioxidant properties and recommended looking for formulations that combine copper peptides with hydrating and barrier-supporting ingredients. [5]
Dr. Jennifer Gordon, board-certified dermatologist
In a February 2026 article published by Westlake Dermatology, Dr. Gordon examined GHK-Cu's scientific background, its potential benefits for skin quality and its place within a balanced skincare routine.
Her assessment recognized copper peptides as scientifically grounded ingredients that may offer useful support for skin health and resilience when used consistently. [6]
These dermatologists aren't endorsing any particular koppā product. Their independent discussions help demonstrate why copper peptides have become a serious topic in evidence-informed skincare.
Why collagen and skin remodelling matter
Collagen and elastin are important structural components of the skin.
As we age, changes in their production, organization and breakdown contribute to visible differences in firmness, elasticity and texture.
What makes GHK-Cu particularly interesting is the research into its influence on the extracellular matrix, the network of structural molecules that helps support skin.
Laboratory investigations have explored its relationship with collagen synthesis, glycosaminoglycans and enzymes involved in tissue remodelling.
Researchers have also studied its effects on fibroblasts, the cells responsible for producing many of the skin's structural components. [2, 3]
Rather than focusing exclusively on how skin feels immediately after application, GHK-Cu research examines biological processes involved in maintaining skin structure over time.
That makes it especially relevant to the growing conversation around skin longevity.
Why formulation matters as much as the ingredient
GHK-Cu's scientific background is compelling, but how it is formulated also matters.
A skincare product isn't simply its headline active ingredient. The surrounding formula influences stability, application, comfort and how an ingredient is delivered to the skin.
In the 2026 Allure investigation, cosmetic chemist Julian Sass, PhD, discussed the importance of formulation factors such as pH, stability, packaging and delivery.
Research reviews have also examined GHK-Cu's stability and movement through model skin barriers. [1, 2, 7]
This is why choosing a copper peptide product should involve looking beyond a percentage on the label.
It is also why hydrating ingredients, barrier-supporting ingredients and the overall feel of a formula deserve attention.
After all, skincare only becomes part of a long-term routine when people actually enjoy using it.
Why we built koppā around GHK-Cu
GHK-Cu is the reason koppā exists.
We were drawn to an ingredient with decades of verified scientific research, a fascinating relationship with skin biology and encouraging findings from human cosmetic studies.
We also believed it deserved formulations designed for real, everyday use.
Our approach is to combine GHK-Cu with carefully selected supporting ingredients, while being transparent about our stated active concentrations.
GHK-Cu Copper Peptide Serum
Our 45 mL, water-light serum contains a stated 2% GHK-Cu concentration alongside supporting peptides and hydrating ingredients. It is designed as the foundational step in a simple skin longevity routine.
GHK-Cu Advanced Capsule Cream
Our 80 g cream contains 0.5% GHK-Cu, 5% niacinamide, 4% squalane and 3% jojoba, bringing copper peptide skincare together with ingredients selected for lasting hydration and skin comfort.
GHK-Cu Face + Body Balm Stick
Our portable 20 g balm stick contains 0.5% GHK-Cu, eight supporting peptides, jojoba and squalane. Its water-free format makes it convenient for targeted application to the face, neck and other areas throughout the day.
Each product has a different role, but all three share the same philosophy: consistent skincare built around a researched ingredient, supported by thoughtfully chosen formulas.
The published GHK-Cu studies weren't conducted on koppā's finished products, and differences in formulation can affect results. We use that scientific research to inform our ingredient choices, not as a substitute for product-specific testing.
The science is still moving forward
Although GHK-Cu has been researched for decades, interest in its cosmetic applications continues to develop.
A 2025 scientific review revisited topically applied GHK as an anti-wrinkle ingredient, examining both its potential and the importance of effective skin delivery. [7]
There is still room for larger, independently replicated human trials and direct comparisons between finished formulations.
But that doesn't diminish the biological research already published, or the encouraging observations from existing cosmetic studies.
It gives researchers and formulators a foundation on which to keep building.
The bottom line
The excitement around GHK-Cu isn't based on a newly invented ingredient or a fleeting social media trend.
It is rooted in more than five decades of research into a naturally occurring peptide involved in collagen-related processes, skin remodelling and tissue repair.
Human studies have reported encouraging improvements in firmness, density, fine lines and overall skin appearance. And dermatologists are increasingly discussing where copper peptides may fit into modern skincare.
For us, that combination of established research and continued scientific interest is what makes GHK-Cu so compelling.
Skin longevity isn't about pretending we can stop ageing. It's about giving our skin thoughtful, consistent care, using ingredients with a meaningful scientific foundation.
That's what koppā was built around.
Frequently asked questions
Do dermatologists recommend GHK-Cu?
Some board-certified dermatologists, including Drs. Nancy Samolitis, Marisa Garshick and Jennifer Gordon, have publicly discussed the potential benefits of copper peptides. Their comments highlight scientific interest in GHK-Cu as a supporting ingredient in skincare, rather than a universal recommendation for everyone.
Does GHK-Cu support collagen production?
Laboratory research has demonstrated collagen-related activity, while small human studies have reported encouraging findings involving collagen production and skin density. [2, 3, 4]
Can GHK-Cu improve wrinkles and firmness?
Small human cosmetic studies have reported improvements in fine lines, wrinkle appearance, firmness and skin density after approximately 12 weeks of topical use. Results vary by formulation and individual. [2]
Can copper peptides be used in a daily skincare routine?
Yes. Topical copper peptide products can be incorporated into everyday routines according to their formulation and instructions. Dermatologists also emphasize the importance of sunscreen, hydration and a balanced approach to skincare. [5, 6]
Is a higher GHK-Cu percentage always better?
No. Concentration is one factor, but formulation stability, delivery, compatibility and tolerability also influence product performance. There isn't enough comparative clinical research to establish that higher percentages consistently produce better results. [1, 7]
Scientific references and dermatologist commentary
1. Tan S. (2026). Are Compounded Peptide Creams Any Better Than Over the Counter Options? Allure. Includes dermatologist commentary from Nancy Samolitis, MD, and formulation commentary from Julian Sass, PhD.
https://www.allure.com/story/ghkcu-copper-peptide-skin-care-cream-compound
2. Pickart L, Vasquez-Soltero JM, Margolina A. (2015). GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration. BioMed Research International. DOI: 10.1155/2015/648108.
https://pmc.ncbi.nlm.nih.gov/articles/PMC4508379/[1]
3. Pickart L, Margolina A. (2018). Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data. International Journal of Molecular Sciences. DOI: 10.3390/ijms19071987.
https://pmc.ncbi.nlm.nih.gov/articles/PMC6073405/[2]
4. Abdulghani AA et al. (1998). Effects of topical creams containing vitamin C, a copper-binding peptide cream and melatonin compared with tretinoin on the ultrastructure of normal skin.
5. British Vogue. (2026). Why Copper Peptides Are the Skincare Ingredient to Know About. Includes commentary from Marisa Garshick, MD.
https://www.vogue.co.uk/article/best-copper-peptides
6. Gordon J, MD. (2026). A Dermatologist's Take on the Copper Peptide (GHK-Cu) Skin Care Trend. Westlake Dermatology.
https://www.westlakedermatology.com/trends/ghk-cu-copper-peptides-for-skin-care/
7. Topically Applied GHK as an Anti-Wrinkle Peptide: Advantages, Problems and Prospective. (2025). Indexed in PubMed.
https://pubmed.ncbi.nlm.nih.gov/39963574/[3]
Sources and further reading
- Loren Pickart et al. (2015). GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration. BioMed Research International. DOI: 10.1155/2015/648108 pmc.ncbi.nlm.nih.gov
- Loren Pickart et al. (2018). Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data. International Journal of Molecular Sciences. DOI: 10.3390/ijms19071987 pmc.ncbi.nlm.nih.gov
- https://pubmed.ncbi.nlm.nih.gov/39963574/</span pubmed.ncbi.nlm.nih.gov
